Abstract: Disclosure herein includes a pipeline system that includes a pipeline including an upstream pipeline section and a downstream pipeline section, and an injection system interposing the upstream and downstream pipeline sections and including an annular body operatively coupled to the upstream and downstream pipeline sections, an injection chamber defined within a sidewall of the annular body, an external reservoir in fluid communication with the injection chamber, and one or more nozzles provided on the annular body and in fluid communication with the injection chamber. An injection fluid is injected into an interior of the pipeline via the one or more nozzles to mix with a fluid flowing within the pipeline.